diff --git a/x/ibc/07-tendermint/client/cli/tx.go b/x/ibc/07-tendermint/client/cli/tx.go
index f22b3d91440c..bd82a0f13e1b 100644
--- a/x/ibc/07-tendermint/client/cli/tx.go
+++ b/x/ibc/07-tendermint/client/cli/tx.go
@@ -105,7 +105,7 @@ func GetCmdCreateClient(cdc *codec.Codec) *cobra.Command {
 			case "simple":
 				specs = []*ics23.ProofSpec{ics23.TendermintSpec}
 			default:
-				return fmt.Errorf("proof Spec: %s not supported", spc)
+				return fmt.Errorf("proof spec: %s isn't supported", spc)
 			}
 
 			msg := ibctmtypes.NewMsgCreateClient(
diff --git a/x/ibc/07-tendermint/types/client_state_test.go b/x/ibc/07-tendermint/types/client_state_test.go
index 11b1f429accb..5f2d5a6ae8e5 100644
--- a/x/ibc/07-tendermint/types/client_state_test.go
+++ b/x/ibc/07-tendermint/types/client_state_test.go
@@ -1,6 +1,7 @@
 package types_test
 
 import (
+	ics23 "github.com/confio/ics23/go"
 	tmmath "github.com/tendermint/tendermint/libs/math"
 	lite "github.com/tendermint/tendermint/lite2"
 
@@ -60,6 +61,21 @@ func (suite *TendermintTestSuite) TestValidate() {
 			clientState: ibctmtypes.NewClientState(testClientID, lite.DefaultTrustLevel, trustingPeriod, ubdPeriod, maxClockDrift, ibctmtypes.Header{}, commitmenttypes.GetSDKSpecs()),
 			expPass:     false,
 		},
+		{
+			name:        "trusting period not less than unbonding period",
+			clientState: ibctmtypes.NewClientState(testClientID, lite.DefaultTrustLevel, ubdPeriod, ubdPeriod, maxClockDrift, suite.header, commitmenttypes.GetSDKSpecs()),
+			expPass:     false,
+		},
+		{
+			name:        "proof specs is nil",
+			clientState: ibctmtypes.NewClientState(testClientID, lite.DefaultTrustLevel, ubdPeriod, ubdPeriod, maxClockDrift, suite.header, nil),
+			expPass:     false,
+		},
+		{
+			name:        "proof specs contains nil",
+			clientState: ibctmtypes.NewClientState(testClientID, lite.DefaultTrustLevel, ubdPeriod, ubdPeriod, maxClockDrift, suite.header, []*ics23.ProofSpec{ics23.TendermintSpec, nil}),
+			expPass:     false,
+		},
 	}
 
 	for _, tc := range testCases {
diff --git a/x/ibc/07-tendermint/types/msgs_test.go b/x/ibc/07-tendermint/types/msgs_test.go
index cd354ea0b2b3..686dbfc2c5f3 100644
--- a/x/ibc/07-tendermint/types/msgs_test.go
+++ b/x/ibc/07-tendermint/types/msgs_test.go
@@ -33,6 +33,8 @@ func (suite *TendermintTestSuite) TestMsgCreateClientValidateBasic() {
 		{ibctmtypes.NewMsgCreateClient(exported.ClientTypeTendermint, ibctmtypes.Header{}, lite.DefaultTrustLevel, trustingPeriod, ubdPeriod, maxClockDrift, commitmenttypes.GetSDKSpecs(), signer), false, "nil header"},
 		{ibctmtypes.NewMsgCreateClient(exported.ClientTypeTendermint, invalidHeader, lite.DefaultTrustLevel, trustingPeriod, ubdPeriod, maxClockDrift, commitmenttypes.GetSDKSpecs(), signer), false, "invalid header"},
 		{ibctmtypes.NewMsgCreateClient(exported.ClientTypeTendermint, suite.header, lite.DefaultTrustLevel, trustingPeriod, ubdPeriod, maxClockDrift, []*ics23.ProofSpec{nil}, signer), false, "invalid proof specs"},
+		{ibctmtypes.NewMsgCreateClient(exported.ClientTypeTendermint, suite.header, lite.DefaultTrustLevel, trustingPeriod, ubdPeriod, maxClockDrift, nil, signer), false, "nil proof specs"},
+		{ibctmtypes.NewMsgCreateClient(exported.ClientTypeTendermint, suite.header, lite.DefaultTrustLevel, ubdPeriod, ubdPeriod, maxClockDrift, commitmenttypes.GetSDKSpecs(), signer), false, "trusting period not less than unbonding period"},
 	}
 
 	for i, tc := range cases {